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If you followed the directions for installing a high quality underlayment, you
should have an excellent base upon which to install the roof cover of your choice.
There is no accepted guide for installing metal roofs. We are not aware of any
specific document that outlines guidelines for installing wind resistant metal
roofs. This may well be due to the wide variety of products and installation
methods. Consequently, if you want to check on installation information, request
a copy of the manufacturer's installation recommendations; or you can check specific
product approval information for a particular metal roof at the
Florida Department of Community Affairs Product Approval
website by looking up the product approval information and the evaluation report.
The general keys to getting a wind resistant metal roof installation are to ensure
that the lowest fasteners, clips or straps are installed close to the roof eave and
that the manufacturer's recommended spacing of fasteners is followed very carefully
so that there are no large gaps or spaces between fasteners. Many of the failures
that have been observed have occurred to the panels that cover the hips and ridges.
Newer products frequently have screws along the bottom edge of these panels to help
avoid the kinds of failures shown below. If a longer cap is installed, it may be
prudent to have fasteners installed at a closer spacing than that recommended by
the manufacturer.
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The metal tiles covering the hip
ridges did not have adequate
anchorage at their bottom edges
and many lifted up when the
hurricane swept through.
(click image for larger version) |
Note damage to hip edge metal
of the metal roof.
(click image for larger version) |
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